The UEFI "secure boot" is designed to stop malware from hiding in the BIOS, before the operating system boots, by only allowing "approved" code to run. If the Microsoft secure boot 'requirement' on ARM computers is approved, this would prevent Linux distributions like Ubuntu being installed either alongside Windows or replacing Windows.

See:
http://www.zdnet.com/blog/open-source/microsoft-to-lock-out-other-operating-sys tems-from-windows-8-arm-pcs-devices/10132?tag=content;siu-container

This is anti-competitive and should not be allowed.

Problem: when installing Ubuntu, you have the option to install propriety extras. Confusingly, if the user wants the restricted extras installed e.g. Flash Player, Microsoft fonts etc. then the user must install these restricted extras AFTER Ubuntu has been installed.

I'm writing this idea to hopefully clear up the confusion which inexperienced users face when installing Ubuntu; they will assume that restricted extras have already been installed DURING the Ubuntu installation (if they ticked/checked the right boxes), when in fact this is NOT the case!